因为要用到improved dense trajectory特征,用源码需要编译ffmpeg和OpenCV,网址给出的源码需要的OpenCV-2.4.2 和ffmpeg-0.11.1都比较老,我用的是比较新的opencv2.4.12和ffmpeg-snapshot.tar.bz2 (2016-05-22)。
本文主要基于此官方指导编译
1. 安装依赖
sudo apt-get update
sudo apt-get -y install autoconf automake build-essential libass-dev libfreetype6-dev libsdl1.2-dev libtheora-dev libtool libva-dev libvdpau-dev libvorbis-dev libxcb1-dev libxcb-shm0-dev libxcb-xfixes0-dev pkg-config texinfo zlib1g-dev
mkdir ~/ffmpeg_sources
Yasm
sudo apt-get install yasm
libx264
sudo apt-get install libx264-dev
libx265
sudo apt-get install cmake mercurial
cd ~/ffmpeg_sources
hg clone https:///multicoreware/x265
cd ~/ffmpeg_sources/x265/build/linux
PATH="$HOME/bin:$PATH" cmake -G "Unix Makefiles" -DCMAKE_INSTALL_PREFIX="$HOME/ffmpeg_build" -DENABLE_SHARED:bool=off ../../source
make
make install
make distclean
libfdk-aac
cd ~/ffmpeg_sources
wget -O fdk-aac.tar.gz https://github.com/mstorsjo/fdk-aac/tarball/master
tar xzvf fdk-aac.tar.gz
cd mstorsjo-fdk-aac*
autoreconf -fiv
./configure --prefix="$HOME/ffmpeg_build" --disable-shared
make
make install
make distclean
libmp3lame
sudo apt-get install libmp3lame-dev
libopus
sudo apt-get install libopus-dev
libvpx
cd ~/ffmpeg_sources
wget http://storage./downloads.webmproject.org/releases/webm/libvpx-1.5.0.tar.bz2
tar xjvf libvpx-1.5.0.tar.bz2
cd libvpx-1.5.0
PATH="$HOME/bin:$PATH" ./configure --prefix="$HOME/ffmpeg_build" --disable-examples --disable-unit-tests
PATH="$HOME/bin:$PATH" make
make install
make clean
avdevice
sudo apt-get install libavdevice-dev
ffmpeg
cd ~/ffmpeg_sources
wget http:///releases/ffmpeg-snapshot.tar.bz2
tar xjvf ffmpeg-snapshot.tar.bz2
cd ffmpeg
PATH="$HOME/bin:$PATH" PKG_CONFIG_PATH="$HOME/ffmpeg_build/lib/pkgconfig" ./configure \
--prefix="$HOME/ffmpeg_build" --pkg-config-flags="--static" --extra-cflags="-I$HOME/ffmpeg_build/include" --extra-ldflags="-L$HOME/ffmpeg_build/lib" --bindir="$HOME/bin" --enable-gpl --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-nonfree
PATH="$HOME/bin:$PATH" make
make install
make distclean
hash -r
到这里ffmpeg就编译安装结束了,编译过的ffmpeg在~/bin 目录下
2、Usage
两种方法使用ffmpeg
- 进入
~/bin 文件夹,然后调用binary文件: cd ~/bin && ./ffmpeg -i ~/input.mp4 ~/videos/output.mkv
- 使用绝对路径:
/home/yourusername/bin/ffmpeg -i ../input.mp4 ../videos/output.mkv
如果想要ffmpeg在所有地方都能直接调用,需要先注销,然后登陆。
或者执行source ~/.profile
3、Documentation
如果想要用man ffmpeg 命令看文档,执行下面命令
echo "MANPATH_MAP $HOME/bin $HOME/ffmpeg_build/share/man" >> ~/.manpath
注销,然后登陆即可。
4、更新FFmpeg
rm -rf ~/ffmpeg_build ~/ffmpeg_sources ~/bin/{ffmpeg,ffprobe,ffplay,ffserver,vsyasm,x264,x265,yasm,ytasm}
5、编译FFMPEG自带的examples,以remuxing.c为例 remuxing: remuxing.o
gcc -Llibavcodec -Llibavdevice -Llibavfilter -Llibavformat -Llibavresample -Llibavutil -Llibpostproc -Llibswscale -Llibswresample -LHOME/ffmpeg_build/lib -Wl,--as-needed -Wl,-z,noexecstack -Wl,--warn-common -Wl,-rpath-link=libpostproc:libswresample:libswscale:libavfilter:libavdevice:libavformat:libavcodec:libavutil:libavresample -o remuxing remuxing.o -lavdevice -lavfilter -lavformat -lavcodec -lpostproc -lswresample -lswscale -lavutil -ldl -ldl -lvdpau -lva -lva-drm -lva -lva-x11 -lva -lxcb -lXau -lXdmcp -lxcb-shm -lxcb -lXau -lXdmcp -lxcb-xfixes -lxcb-render -lxcb-shape -lxcb -lXau -lXdmcp -lxcb-shape -lxcb -lXau -lXdmcp -lX11 -lasound -lx264 -lpthread -lm -ldl -ltheoraenc -ltheoradec -logg -lopus -lm -lmp3lame -lfreetype -lz -lpng12 -L/home/lxm/ffmpeg_build/lib -lfdk-aac -lm -lass -lfontconfig -lenca -lm -lfribidi -lexpat -lfreetype -lz -lpng12 -lm -llzma -lz -pthread
remuxing.o: remuxing.c
gcc -o remuxing.o -I/home/lxm/ffmpeg_build/include -c remuxing.c
6、使用ffmpeg x264进行编码的时候,avcodec_open报错:
[libx264 @ 00021bb0]broken ffmpeg default settings detected [libx264 @ 00021bb0]use an encoding preset (vpre) 解决方法: 在avcodec_open函数之间增加如下几个AVCodecContext 的初始化: /*default settings for x264*/ ctx->me_range = 16; ctx->max_qdiff = 4; ctx->qmin = 10; ctx->qmax = 51; ctx->qcompress = 0.6;
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